Many prehistoric sites located throughout Alaska are surface scatters of lithic (rock) debris, either remaining exposed since occupation or re-exposed due to erosion. Due to their open nature, these sites are often interpreted to lack much of their original context and integrity.
Underground coal fires can burn for years, and are a serious health and environmental hazard. There are four underground coal fires in northern New Mexico: two in close proximity to Gallup, one north of Farmington, and one south of Raton. The New Mexico Abandoned Mine Land Program (NMAMLP) has contracted several coal fire assessments to assist with the development of mitigation/extinguishment plans for these fires.